A former major munitions plant that has been converted into a sprawling art space.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

All that remains of a gigantic earth-moving machine.

Abandoned since the 1950s, the streetcar lane beneath the heavily trafficked bridge lays empty and unused.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Unique collection containing a wide and curious range of contraceptive items.

A dazzling display of lights and crystals.

Medical history museum featuring a lovely doctor's office from the 1800s.

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

Charles Babbage's proto-computer, painstakingly brought to life.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Scattered throughout London are ancient remnants of the city's former bounding wall.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

This enormous gold Buddha statue was hidden inside a stucco decoy for centuries.

One of Ayutthaya’s most iconic locations is a mysterious, hauntingly surreal miracle.

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

A limestone wonderland of water and subterranean secrets.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.